Maximum Scheduled Backend Workflow?

I have two questions regarding limits to backend workflows:

For context, my application is an email reminder system for users, with backend scheduled workflows to trigger emails being sent at specific times. The number of scheduled workflows will be in the tens of thousands (if all goes well with growth).

I have a few questions important to my app on the topic of backend workflows?

  1. Is there a maximum number of backend workflows that can be scheduled?

  2. Does an excessive number of scheduled workflows slow down the speed of the application?

  3. Does scheduling a large number of workflows increase WU (workload units) – potentially if the app is always checking to see if a workflow should be run? Or, alternatively, does a noticeable WU increase occur only when the workflow is run?

For perspective, the actual workflow backend workflow itself is fairly simple, so the event itself does not take considerable WU’s.

Thank you in advance to anyone who takes the time to offer their thoughts.

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